Diagnosis

Your doctor will ask questions about your health and examine your skin, scalp and nails. Your doctor might take a small sample of skin (biopsy) for examination under a microscope. This helps determine the type of psoriasis and rule out other disorders.

Psoriasis treatments aim to stop skin cells from growing so quickly and to remove scales. Options include creams and ointments (topical therapy), light therapy (phototherapy), and oral or injected medication.

Which treatments you use depends on how severe the psoriasis is and how responsive it has been to previous treatment. You might need to try different drugs or a combination of treatments before you find an approach that works for you. Usually, however, the disease returns.

Corticosteroids. These drugs are the most frequently prescribed medications for treating mild to moderate psoriasis. They are available as ointments, creams, lotions, gels, foams, sprays and shampoos. Mild corticosteroid ointments (hydrocortisone) are usually recommended for sensitive areas, such as your face or skin folds, and for treating widespread patches. Topical corticosteroids might be applied once a day during flares, and on alternate days or weekends only to maintain remission.

Your doctor may prescribe a stronger corticosteroid cream or ointment triamcinolone (Acetonide, Trianex), clobetasol (Temovate) for smaller, less-sensitive or tougher-to-treat areas.

Long-term use or overuse of strong corticosteroids can thin the skin. Over time, topical corticosteroids may stop working.

Retinoids. Tazarotene (Tazorac, Avage) is available as a gel and cream and applied once or twice daily. The most common side effects are skin irritation and increased sensitivity to light.

Tazarotene isn't recommended when you're pregnant or breast-feeding or if you intend to become pregnant.

Calcineurin inhibitors. Calcineurin inhibitors such as tacrolimus (Protopic) and pimecrolimus (Elidel) reduce inflammation and plaque buildup. They can be especially helpful in areas of thin skin, such as around the eyes, where steroid creams or retinoids are too irritating or may cause harmful effects.

Calcineurin inhibitors are not recommended when you're pregnant or breast-feeding or if you intend to become pregnant. This drug is also not intended for long-term use because of a potential increased risk of skin cancer and lymphoma.

Coal tar. Coal tar reduces scaling, itching and inflammation. It's available over-the-counter or by prescription in various forms, such as shampoo, cream and oil. These products can irritate the skin. They're also messy, stain clothing and bedding, and can have a strong odor.

Coal tar treatment isn't recommended for women who are pregnant or breast-feeding.

Light therapy is a first-line treatment for moderate to severe psoriasis, either alone or in combination with medications. It involves exposing the skin to controlled amounts of natural or artificial light. Repeated treatments are necessary. Talk with your doctor about whether home phototherapy is an option for you.

Psoralen plus ultraviolet A (PUVA). This treatment involves taking a light-sensitizing medication (psoralen) before exposure to UVA light. UVA light penetrates deeper into the skin than does UVB light, and psoralen makes the skin more responsive to UVA exposure.

This more aggressive treatment consistently improves skin and is often used for more-severe cases of psoriasis. Short-term side effects include nausea, headache, burning and itching. Long-term side effects include dry and wrinkled skin, freckles, increased sun sensitivity, and increased risk of skin cancer, including melanoma.

If you have moderate to severe psoriasis or other treatments haven't worked, your doctor may prescribe oral or injected (systemic) drugs. Because of the potential for severe side effects, some of these medications are used for only brief periods and might be alternated with other treatments.

Methotrexate. Usually administered weekly as a single oral dose, methotrexate (Trexall) decreases the production of skin cells and suppresses inflammation. It's less effective than adalimumab (Humira) and infliximab (Remicade). It might cause upset stomach, loss of appetite and fatigue. People taking methotrexate long term need ongoing testing to monitor their blood counts and liver function.

Men and women should stop taking methotrexate at least three months before attempting to conceive. This drug is not recommended when you're breast-feeding.

Cyclosporine. Taken orally for severe psoriasis, cyclosporine (Neoral) suppresses the immune system. It's similar to methotrexate in effectiveness but cannot be used continuously for more than a year. Like other immunosuppressant drugs, cyclosporine increases your risk of infection and other health problems, including cancer. People taking cyclosporine need ongoing monitoring of their blood pressure and kidney function.

These drugs are not recommended when you're pregnant, breast-feeding or if you intend to become pregnant.

Biologics. These drugs, usually administered by injection, alter the immune system in a way that disrupts the disease cycle and improves symptoms and signs of disease within weeks. Several of these drugs are approved for the treatment of moderate to severe psoriasis in people who haven't responded to first-line therapies. The therapeutic options are rapidly expanding. Examples include etanercept (Enbrel), infliximab (Remicade), adalimumab (Humira), ustekinumab (Stelara), secukinumab (Cosentyx) and ixekizumab (Taltz). These types of drugs are expensive and may or may not be covered by health insurance plans.

Biologics must be used with caution because they carry the risk of suppressing your immune system in ways that increase your risk of serious infections. In particular, people taking these treatments must be screened for tuberculosis.

Although doctors choose treatments based on the type and severity of psoriasis and the areas of skin affected, the traditional approach is to start with the mildest treatments topical creams and ultraviolet light therapy (phototherapy) in people with typical skin lesions (plaques) and then progress to stronger ones only if necessary. People with pustular or erythrodermic psoriasis or associated arthritis usually need systemic therapy from the beginning of treatment. The goal is to find the most effective way to slow cell turnover with the fewest possible side effects.

A number of alternative therapies claim to ease the symptoms of psoriasis, including special diets, creams, dietary supplements and herbs. None have definitively been proved effective. But some alternative therapies are deemed generally safe and might reduce itching and scaling in people with mild to moderate psoriasis. Other alternative therapies are useful in avoiding triggers, such as stress.

If you're considering dietary supplements or other alternative therapy to ease the symptoms of psoriasis, consult your doctor. He or she can help you weigh the pros and cons of specific alternative therapies.

Explore Mayo Clinic studies testing new treatments, interventions and tests as a means to prevent, detect, treat or manage this condition.

Try these self-care measures to better manage your psoriasis and feel your best:

Coping with psoriasis can be a challenge, especially if the affected skin covers a large area of your body or is visible to other people. The ongoing, persistent nature of the disease and the treatment challenges only add to the burden.

Here are some ways to help you cope and to feel more in control:

You'll likely first see your family doctor or a general practitioner. In some cases, you may be referred directly to a specialist in skin diseases (dermatologist).

Here's some information to help you prepare for your appointment and to know what to expect from your doctor.

Make a list of the following:

For psoriasis, some basic questions you might ask your doctor include:

Your doctor is likely to ask you several questions, such as:

Read more:

Psoriasis - Diagnosis and treatment - Mayo Clinic